diff --git a/wolfcrypt/src/random.c b/wolfcrypt/src/random.c
index 4631734d7c..1984c0a5c5 100644
--- a/wolfcrypt/src/random.c
+++ b/wolfcrypt/src/random.c
@@ -1715,7 +1715,7 @@ static int _InitRng(WC_RNG* rng, byte* nonce, word32 nonceSz,
                     void* heap, int devId)
 {
     int ret = 0;
-#ifdef HAVE_HASHDRBG
+#if defined(HAVE_HASHDRBG) && !defined(CUSTOM_RAND_GENERATE_BLOCK)
 #if !defined(HAVE_FIPS) && defined(WOLFSSL_RNG_USE_FULL_SEED)
     word32 seedSz = SEED_SZ;
 #else